Denso 234-8025 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor for Honda Civic

The Denso 234-8025 is a specific-fit heated oxygen sensor built for direct replacement on select Honda Civic applications. It is engineered to match OE-style fit and signal performance, with a threaded mounting design, 4-wire configuration, and a 10.31-inch wiring harness for a clean factory-style installation.

Compatible with 2016-2021 Honda Civic downstream applications, this Denso oxygen sensor supports accurate exhaust feedback for drivability and emissions control. The Denso OE Style line is built to strict OE standards and uses an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination.

Key Features

• Part number: 234-8025
• OE Style direct replacement oxygen sensor
• Heated sensor design for faster operating response
• Specific fit for select Honda Civic downstream locations
• 4-wire, male connector configuration
• Threaded mounting type with 0.701-inch thread diameter
• 10.31-inch wiring harness length
• Built to OE standards for exact replacement fit

Detailed Description

Denso 234-8025 is an OE-style oxygen sensor designed for downstream use on the Honda Civic. It is a direct-fit replacement for 2016-2021 Honda Civic models listed in the fitment data, including 2021 Honda Civic downstream and 2016-2020 Honda Civic downstream applications. This part cross-references Honda 365325BAA01 for the same application.

The sensor is precision built for first-time fitment and consistent installation geometry. Its heated design helps the sensor reach operating temperature efficiently, while the OE-style construction supports stable exhaust monitoring and proper engine management feedback. The Denso 234-8025 is also cross-referenced to NTK 24484 and Walker Products 250-241196, 350-341002.

Common Issues This Part May Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy caused by a worn sensor
• Slow sensor response after contamination or age-related wear
• Emissions test failures tied to oxygen sensor faults

Installation Notes and Tips

Verify the downstream sensor location before ordering and match the connector, wire count, and thread size to the original part. Inspect the harness routing and connector condition during replacement, and confirm the exhaust threads are clean before threading in the new sensor. For 2016-2021 Honda Civic applications, confirm the OE-style direct-fit configuration matches your vehicle’s original downstream sensor.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The aluminum oxide trap layer is used to help protect the sensing element from silicone and lead contamination, supporting long-term sensor durability and stable operation.